Support customizing emulator port (#383)

* Add port parameter

* Fix a typo in test description

* Fix avd not being started with correct port

* Fix wrong port being used to kill an emulator if there was an exception

src/main.ts

@@ -12,6 +12,8 @@ import {
   checkChannel,
   checkEnableHardwareKeyboard,
   checkDiskSize,
+  checkPort,
+  MIN_PORT,
 } from './input-validator';
 import { launchEmulator, killEmulator } from './emulator-manager';
 import * as exec from '@actions/exec';
@@ -20,6 +22,7 @@ import { getChannelId } from './channel-id-mapper';
 import { accessSync, constants } from 'fs';
 
 async function run() {
+  let port: number = MIN_PORT;
   try {
     console.log(`::group::Configure emulator`);
     let linuxSupportKVM = false;
@@ -93,6 +96,11 @@ async function run() {
     const emulatorBootTimeout = parseInt(core.getInput('emulator-boot-timeout'), 10);
     console.log(`Emulator boot timeout: ${emulatorBootTimeout}`);
 
+    // Emulator port to use
+    port = parseInt(core.getInput('emulator-port'), 10);
+    checkPort(port);
+    console.log(`emulator port: ${port}`);
+
     // emulator options
     const emulatorOptions = core.getInput('emulator-options').trim();
     console.log(`emulator options: ${emulatorOptions}`);
@@ -210,6 +218,7 @@ async function run() {
       avdName,
       forceAvdCreation,
       emulatorBootTimeout,
+      port,
       emulatorOptions,
       disableAnimations,
       disableSpellchecker,
@@ -226,17 +235,19 @@ async function run() {
       for (const script of scripts) {
         // use array form to avoid various quote escaping problems
         // caused by exec(`sh -c "${script}"`)
-        await exec.exec('sh', ['-c', script]);
+        await exec.exec('sh', ['-c', script], {
+          env: { ...process.env, EMULATOR_PORT: `${port}`, ANDROID_SERIAL: `emulator-${port}` },
+        });
       }
     } catch (error) {
       core.setFailed(error instanceof Error ? error.message : (error as string));
     }
 
     // finally kill the emulator
-    await killEmulator();
+    await killEmulator(port);
   } catch (error) {
     // kill the emulator so the action can exit
-    await killEmulator();
+    await killEmulator(port);
     core.setFailed(error instanceof Error ? error.message : (error as string));
   }
 }